Engine start control system and control method

Abstract

An engine start control system of the present invention has a power supply controller which includes an ignition power supply relay activating an electric component of a vehicle and a central processing unit controlling the ignition power supply relay, a communication device communicating with a portable unit to authenticate a validity of the portable unit and performing engine start control. Further, the engine start control system has the a first drive line provided between the communication device and the ignition power supply relay and not routed through the central processing unit. By this structure, the system can obtain redundancy.

1. An engine start control method, comprising:
 preparing a power supply controller which includes an ignition power supply relay activating an electric component of a vehicle and a central processing unit controlling the ignition power supply relay, a communication device which communicates with a portable unit to authenticate a validity of the portable unit and performs engine start control, and a drive line which is provided between the communication device and the ignition power supply relay and is not routed through the central processing unit, and 
 transmitting a signal to activate the electric component from the communication device to the ignition power supply relay using the drive line when the power supply controller fails. 
 
     
     
       2. An engine start control system, comprising:
 power supply controlling means which includes: an ignition power supply relay activating an electric component of a vehicle; and a central processing unit controlling the ignition power supply relay; 
 communication means for communicating with a portable unit to authenticate a validity of the portable unit and performing engine start control; and 
 a first drive line provided between the communication means and the ignition power supply relay and not routed through the central processing unit. 
 
     
     
       3. An engine start control system, comprising:
 a power supply controller which includes: an ignition power supply relay activating an electric component of a vehicle; and a central processing unit controlling the ignition power supply relay; 
 a communication device communicating with a portable unit to authenticate a validity of the portable unit and performing engine start control; and 
 a first drive line provided between the communication device and the ignition power supply relay and not routed through the central processing unit. 
 
     
     
       4. The engine start control system according to  claim 3 ,
 wherein the power supply controller includes a starter power supply relay which supplies electric power to an engine system and is controlled by the central processing unit, and 
 a second drive line not routed through the central processing unit is provided between the communication device and the starter power supply relay. 
 
     
     
       5. The engine start control system according to  claim 3 , further comprising:
 a first multiplex communication line provided between the communication device and the power supply controller. 
 
     
     
       6. The engine start control system according to  claim 3 , further comprising:
 an electric power steering lock device controlling locking or unlocking of an electric power steering column; and 
 a steering lock state detection device detecting a state of a lock rod with which the electric power steering column is locked or unlocked, 
 wherein the power supply controller controls a steering lock power supply relay connected to the central processing unit and the electric power steering lock device. 
 
     
     
       7. The engine start control system according to  claim 3 , further comprising:
 a second multiplex communication line provided between the power supply controller and the electric power steering lock device.